MARCHFLY (With its counterpart)

With its structure and appearance, which have not altered for tens of millions of years, the marchfly is one of the countless life forms that challenge the theory of evolution. These insects, which average 3 to 12 millimeters (0.1 to 0.4 in) in length, emerge in the springtime, live close to the surface of the soil, and damage plants. The organisms belonging to this family are some of the oldest known flies.